Advertisements
Advertisements
प्रश्न
V = IRTwo resistances X and Y are connected turn by turn : (i) in parallel, and (ii) series. In which case the resultant resistance will be less than either of the individual resistances?R = R1+ R2+ R3
Advertisements
उत्तर
When two resistors, X and Y are connected in parallel combination, the total resistance will be less than the individual resistance. The total resistance in a parallel arrangement is given by:
`1/R=1/R_1+1/R_2`
where as in a series combination, the total resistance is more than the individual resistances. The total resistance in a series combination is given by:
R = R1+ R2
APPEARS IN
संबंधित प्रश्न
In series combination which remains constant?
(a) Voltage
(b) Current
(c) Both current and voltage
(d) Both are variables
Find the equivalent resistance between points A and B.
Name the material which is the best conductor of electricity.
Give one example to show how the resistance depends on the nature of material of the conductor.
Give the law of combination of resistances in series.
If five resistances, each of value 0.2 ohm, are connected in series, what will be the resultant resistance?
The diagram below shows part of a circuit:
If this arrangement of three resistors was to be replaced by a single resistor, its resistance should be:
(a) 9 Ω
(b) 4 Ω
(c) 6 Ω
(d) 18 Ω
State how are the two resistors joined with a battery when equivalent resistance is more than either of the two resistances.
A given metallic wire of resistance R is doubled on itself. What will be its new resistance?
Name the material of wire used for making standard resistances. Give a reason.
Write an expression for the resistance of a conducting wire in terms of its length and area of cross-section.
The voltage applied to a given rheostat is made four times its initial value. By what factor will be resistance of the rheostat change?
What is a resistance? Define it with respect to Ohm’s law,
Calculate the equivalent resistance between the points A and B for the following combination of resistors:
The resistance of two resistors joined in series is 8Ω and in parallel is 1.5Ω. Find the value of the two resistances.
Consider the following combinations of resistors:
The combinations having equivalent resistance 1 Q is/are ______.
